The OP27 circuit we used is just as shown below except the resistor values are
200 Ohms between pin 11 of the AD600 and pin 2 of the OP27. The feedback
resistor is 430 Ohms.
The output of the OP27 is capacitively coupled (through a 0.01uF capacitor)
into a TTE passive low pass filter with a 300kHz bandwidth (part number